MAC Address Table

4.5.4 MAC Address T Table able

MAC Address Table

MAC Address Table  displays MAC addresses learned when System Reset and MAC  displays MAC addresses learned when System Reset and MAC  Address Learning are

 Address Learning are enabled.enabled.

The table above shows the MAC addresses learned from each port

The table above shows the MAC addresses learned from each port of the Managed Swiof the Managed Switch.tch.

Click

Click UpdateUpdate to update the MAC Address Table. to update the MAC Address Table.

Click

Click Clear Clear  to clear the MAC Address table. to clear the MAC Address table.

4.5.5 IGMP Snooping 4.5.5 IGMP Snooping

The Internet Group Management Protocol (IGMP) is a communications protocol used to The Internet Group Management Protocol (IGMP) is a communications protocol used to manage the membership of Internet Protocol multicast groups. IGMP is used by IP hosts manage the membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent multicast routers to establish multicast group memberships. It can be used for and adjacent multicast routers to establish multicast group memberships. It can be used for online streaming video and gaming, and allows more efficient use of resources when online streaming video and gaming, and allows more efficient use of resources when supporting these uses.

supporting these uses.

IGMP Snooping is the process of l

IGMP Snooping is the process of listening to IGMP traffic. IGMP istening to IGMP traffic. IGMP snooping, as implied by thesnooping, as implied by the name, is a feature that allows the switch to "listen in" on the IGMP conversation between name, is a feature that allows the switch to "listen in" on the IGMP conversation between hosts and routers by processing the layer 3 IGMP packets sent in a multicast network.

hosts and routers by processing the layer 3 IGMP packets sent in a multicast network.

When IGMP snooping is enabled in a switch it analyses all the IGMP packets between hosts When IGMP snooping is enabled in a switch it analyses all the IGMP packets between hosts connected to the switch and multicast routers in the network. When a switch hears an IGMP connected to the switch and multicast routers in the network. When a switch hears an IGMP report from a host for a given multicast group, the switch adds the host's port number to the report from a host for a given multicast group, the switch adds the host's port number to the multicast list for that group. And, when the switch hears an IGMP Leave, it removes the multicast list for that group. And, when the switch hears an IGMP Leave, it removes the host's port from the table entry.

host's port from the table entry.

IGMP snooping can very effectively reduce multicast traffic from streaming and other IGMP snooping can very effectively reduce multicast traffic from streaming and other bandwidth intensive IP applications. A switch using IGMP snooping will only forward bandwidth intensive IP applications. A switch using IGMP snooping will only forward multicast traffic to the hosts interested in that traffic. This reduction of multicast traffic multicast traffic to the hosts interested in that traffic. This reduction of multicast traffic

handle the multicast tables) and also reduces the workload at the end hosts since their handle the multicast tables) and also reduces the workload at the end hosts since their network cards (or operating system) will not have to receive and filter all the multicast traffic network cards (or operating system) will not have to receive and filter all the multicast traffic generated in the network.

generated in the network.

Select the option

Select the option IGMP SnoopingIGMP Snooping  from the  from the Switch Monitor Switch Monitor   menu, then the following  menu, then the following screen page shows up.

screen page shows up.

The IGMP querier periodically sends IGMP general queries to all hosts and routers The IGMP querier periodically sends IGMP general queries to all hosts and routers (224.0.0.1) on the local subnet to find out whether active multicast group members exist on (224.0.0.1) on the local subnet to find out whether active multicast group members exist on the subnet.

the subnet.

Upon receiving an IGMP general query, the Managed Switch forwards it through all ports in Upon receiving an IGMP general query, the Managed Switch forwards it through all ports in the VLAN except the receiving port.

the VLAN except the receiving port.

Index:

Index: The index of the multicast group.The index of the multicast group.

Multicast Group:

Multicast Group: The multicast IP address of IGMP querier. The multicast IP address of IGMP querier.

1 ~ 9:

1 ~ 9: The port number.The port number.

Queries:

Queries: The state of IGMP querier in the VLAN. The state of IGMP querier in the VLAN.

Reports:

Reports: The total IGMP report packets rThe total IGMP report packets received.eceived.

Aging Out:

Aging Out: The countdown timer shows the remaining time (the default countdown time isThe countdown timer shows the remaining time (the default countdown time is 300 seconds) left before each entry

300 seconds) left before each entry‟‟s statistics is cleared. When the report comes in, thes statistics is cleared. When the report comes in, the counter will be refreshed (counting down from 300 seconds). When there are no new reports counter will be refreshed (counting down from 300 seconds). When there are no new reports and time is up,

and time is up, each row‟seach row‟s statistics will be cleared.statistics will be cleared.

4.5.6 Loop Status 4.5.6 Loop Status

Select the option

Select the option Loop StatusLoop Status  from the  from the Switch MonitorSwitch Monitor menu, then the following screenmenu, then the following screen page shows up.

page shows up.

Local Port:

Local Port: This shows the port number on  This shows the port number on the Managed Switch.the Managed Switch.

Loop:

Loop: If the port detects a loop, it will showIf the port detects a loop, it will show ““yesyes””. Otherwise,. Otherwise, ““nono”” will be displayed. will be displayed.

Loopback-port:

Loopback-port: The port number that  The port number that receives loop detection packets.receives loop detection packets.

Lock:

Lock: This shows whether the local port is locked or not.This shows whether the local port is locked or not.

4.5.7 LLDP Status 4.5.7 LLDP Status

Select the option

Select the option LLDP StatusLLDP Status from the from the Switch MonitorSwitch Monitor menu, then the following screenmenu, then the following screen page shows up.

page shows up.

Local Port:

Local Port: This shows the port number on  This shows the port number on which LLDP frames are received.which LLDP frames are received.

Chassis ID:

Chassis ID: This shows the MAC address of This shows the MAC address of the LLDP frames received.the LLDP frames received.

Remote Port:

Remote Port: This shows the neighbor This shows the neighbor port number.port number.

System Name:

System Name: This shows the system name advertised by the neighbor device.This shows the system name advertised by the neighbor device.

System Capabilities:

System Capabilities: This show the system capability (bridge or router).This show the system capability (bridge or router).

Management Address:

Management Address: This show the IP address of the This show the IP address of the neighbor device.neighbor device.

Press

Press UpdateUpdate to refresh the table. to refresh the table.